Portable spraying apparatus.



` D. W. WADSWORTH. PORTABLE SPRAYING APPARATUS. APLIOATION FILED'APR. 17. 1907.

Patented Aug. 31, 1909.

3 SHEETS-SHEET 1.

:invento/a D. W.. WADSWORTH.

PORTABLE SPRAYING APPARATUS.

A APPLICATION FAILED APB.. 17. 1907. 932,520.

D. WLWASWORTH.-

PORTABLE srmme ArPABATUS..

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Specication ofLetters Patent.

'Application med April 17,1907, serial No. 368,719.

To all 'whom 'it may concern:

Be it known that I, DWIGHT W. Wansvvonrn, a citizen of the United States, residmg at Bangor, in the county of Van Buren and State of Michigan, have invented new and useful Improvements in Portable Spraying Apparatus, of which the following is a specification.

This invention relates to improvements in portable sprayers of that type for spraying trees, etc., with a liquid insecticide and employing a4 pump having an air chamber and designed to be operated by 'a gasolene or other similar motor.

It is preferable for many reasons to have the 'pump and motor operate continuously, but such an operation is inexpedient with present constructions, as no means are afforded to relieve the `airchamber from an excess pressure which would be produced by the continual action of the pump when the discharge of the liquid through the sprayer portation of the apparatus from tree to tree.

pipe or pipes is cut 0E, as during the trans- The object of the present invention is to provide a means for permitting the liquid in the pump to pass back to the supply tank or reservoir when it is not being sprayed and allowing the motor and pump to operate.

continuously.

`With the above and other objects in view',

the invention consists of the novel construe` tion, combination and arran ement of parts, hereinafter fully describe and4 claimed, reference being had to theaccompanying drawings, in which f Figure l is a front elevation of a spraying apparatus embodying the invention. y F ig. 2 isa side elevation thereof. Fig. 3 is a top plan view. Fig. 4 is a section through the lower portionV of the pressure device for 'operating the relief valve. Fig. 5 is a vertical section through, the iow connection between the pump and air chamber. Figs. 6 and 7 are views of the relief valve. F1g.f8 is a plan view of the complete transportable apparatus. A I

Referring to the drawings, the numeral 1 "designates a liquid suction and discharge pump, above'whichis arranged an air pressure chamber 2, provided witha pressure 'gage3. The pump l is preferably one of'a type especially adapted for use lin a spraying apparatus, such as a Deming doubleacting spray pump. This pump is provided -With vthe usual intake and outlet check valves and with an' inlet 4L designed. to be suitably connected as by a pipe La with the tank or reservoir A containing the solution to 4be sprayed.

5 designates the piston rod of the pump which is driven in practice from a suitable rammed Aug. ai, ieee.

motor, preferably a gasolene or other hydrocarbon motor B. The parts of the apparatus are mounted upon a vehicle or wheeled support C for ready movement across a field in the operation of spraying the trees. It is desirable in practice to have the ump operate continuously in order to avoid the wear, tear and labor caused by the necessity of freuently starting and stopping the motor in t e transportation of the apparatus from tree to tree. As usual in such appliances, the discharge port of the pump is connected with the lovvei` end or inlet of the air chambei' 2 by a connection 6 providing a port or passage 7 communicating? with the lower inlet Vend of the air chamber, from which inlet end of said chamber extends an outlet 8 to which the spray pipe or pipes D of the ap-- paratus are coupled, suchv pipe or pipes being piovidedwith spraying nozzles D and controlling valves D2. In the present instance a Y-coupling 9 is shown connected with the outlet 8 for the application of a pair of discharge pipes or Vtubes D of the characterde'- sage 7 is interiorly threaded to receive a cup/-` shaped valve seat or e 10 having a port therein controlled by a c eck valve 11, preferably of the ball type, said valve serving to admit liquid to the chamber .2 and maintain a determined pressure therein. A is a pipe y order to overcome this' objection, the resent invention provides means whereby -a er the discharge of liquid is cut of and the pressure increases to a ypredeteriiiined extent the liqscribed. A portion-of the wall of the pasuid will be forced through an automatically opened auxilia outlet back to the tank,

l "thusallowing t e pump to continually opcrate, the construction bein such as t automaticallyclose said outlet or the supply of the liquid to the dischargepipe when the valves in the latter are again openedand the pressure decreased to the normal. point. To

' 7 this endf ian outlet pipe 12 is provided and communicates with the passa e 7 of the connection 6 'below' the check va ve 11, and this pipe communicates with a valve 'chamber 13 having ian outlet- 14 for a suitable return connection, as a pipe 14, to the tank, the ow ofthe fluid through said valve chamber being controlled by "a valve.15. A pressurecontrolled or regulated device is provided to 'control the valve 15 and comprises a tube'or the lower ,end of the .tube 16 from the chamber 2, and its vupward movementunder such pressure is resisted by the action of a spring 21, inclosing -the stem between the piston land head 17. `When the ressure in the tube 16 rises to a determine degree above the normal pum ing pressure, the piston vis forced upwar y in said tube against the resistance of thespring. lA connecting rod is employed to transmit motion yfrom the piston to the valve 15, and is herein shown in the form of ayoke 21 composed of arallel arms 22 arranged on opposite sides o the tube and outlet 8 and connected at their lower ends I by al cross-piece 23,l pivotally attached by a link 23 to a lever 24 Iconnected with a crank' arm 23b attached to the valve 15, whereby the 'up and`down` movements of said connecting rodor yokewill raise and lower the leverA and consequently, by `a rockingmotion, open and close the valve. The upper ends of the arms 22 are connected by a cross piece or head 25 having a vertical opening through which the stem 19 entends, and formed with a` slot y receivinga nut 26 engaging the threaded.l`

portion of the stem by which the latter'may be adjusted to regulate the stroke or extent of movement ofthe rod :and consequently thedegree of opening movement of the valve under differentV ressures. Preferably ther lever 24 has itsv ee `end extending beyond the linkai'id formed to provide a handle 24B.

Y A whereby said. lever may be manually operated toopen therelief-valve when it is dei Asind, at any time and without regard to the pressure in the air chamber, to have thev pumped liquid pass back to the tank.

lower 'end with the lever.

The apparatus operates in the usual inanner when the valves in the dischargepipes` are o en, the valve 15 being closed and the li ui discharging through` the outlet 8. Vhen the valves in the discharge pipes are closed, however, -and the pressure increases above the normal from the continued operation ofthe pump, the-piston 18 will be elevated to a proportionate extent, according to the increased pressure, andwill o en the valve- 15, thus allowing the liqui being pumped to pass through the outlet 14 back to the tank. Upon the opening of the valve 15, it will be understood that the decrease of pressure on the underside of the valve 11 will cause said valve to automatically close, thus retaining the normalair pressure within the chamber 2. This operation will continue as long as the valves in the discharge pipes are closedand the pressure ex? ceeds the normal pumping pressure', allowing the liquid pumped from the tank to'be returned thereto. The closin of the valve 11 during these conditions a o causes the load to' be taken olf the motor, because it does not pumpsagainst anyr air pressure when the valve 15 is open and said valve 11 closed. When the va ves in the discharge pipes are again opened for the spraying of the solution, the pressure in the bottom of the tube 16 decreases and the spring 21 restores the piston to normal position, thus moving the yoke downward and closing the valve 15, the resulting increase of pressure causing the check valve 11 to o en for the operation of the pump against t e air pressure in the chamber 2.

It will accordingly be seen that by the use of the novel features of the invention, the pump .may operate continuously, thus materially increasing the eiciency of spraying ap aratus of'this ty e..

aving thus descried the invention, what is claimed as new is z-- A 1.l A relief mechanism for spray'pumping apparatus comprising a pivoted relief valve a pressure-'cylinder adapted` to be connected` apparatus comprising a pivoted relief valve,

a pressure cylinder adaptedto be connected atits lowerend with the air chamber of the pump, a spring retracted piston operating in said cylinder, a." lever operatively connected withsaid reliefval-ve, andqa rod adjustably connectedatits'upper end'with the piston stem. and pivotally connected atits 3. A relief mechanism for spray pumping vapparatus comprising apivoted relief valve x said cylinder andV having an upwardly exf k y eeageae stem, and a connecting the lower'end of the yoke with thel valve lever., y l0 n testimon whereof, I my signature in presence o two witnesses..

' DWIGHT W. WADS`WORTH- a pressure cylinderadapted to be connec at its lower end with thevair chamber of tlie pump, a spring retracted piston movable Aim tending threaded stem, 'a' lever .connected Witnessefezl t with the relief valve, `a oke, means` a 'ust` Y Doorn, i a 1392* ably connecting the yo e with the piston. 

